-- @testpoint: opengauss关键字free(非保留)，作为函数名，合理报错

--关键字不带引号-成功
drop function if exists free;
create function free(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function if exists free;

--关键字带双引号-成功
drop function if exists "free";
create function "free"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function if exists "free";

--关键字带单引号-合理报错
drop function if exists 'free';
create function 'free'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/

--关键字带反引号-合理报错
drop function if exists `free`;
create function `free`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/